Changxing Pei

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In this paper, we propose a novel scheduling architecture for IEEE 802.16 broadband wireless access network. Based on the WFQ and WF2Q which play an important role in wired network, we do more deeply research in how integrate these algorithm into IEEE 802.16. Then, a QoS architecture with WFQ algorithm is proposed. A model for our new scheduling structure(More)
In this paper, we present a nonintrusive and time-based mechanism to estimate the available bandwidth of a node with the nodes collision and backoff stage taken into account. We first give a new definition of available bandwidth in IEEE802.11b network to reflect the collision and contention between nodes. Then, the investigated node obtains the NAV(More)
This correspondence considers the optimal training design in a classical three-node amplify-and-forward two-way relay network (TWRN) that targets at estimating the individual channel between each source node and the relay node. The transmission environment is assumed to be frequency selective and the orthogonal-frequency-division multiplexing (OFDM)(More)
Nonstationarity and nonlinearity are found by the analysis of various delay series measured from different Internet links. The fact that different types of links have different degrees of self-similarity is also obtained. By constructing appropriate network architecture and neural functions, functional networks can be used to model the Internet end-to-end(More)
A new QoS (quality of services)-oriented hybrid admission control (QHAC) scheme in IEEE 802.11 WLAN is proposed, in which the influence of the mobile station with slow speed on other stations is decreased by limiting its inter-request time. In addition, end-to-end performance metrics are also measured and applied to make a decision to admission control of(More)
IEEE 802.16d adopts HARQ (hybrid automatic retransmission request) and AMC (automatic modulation and coding) as link adaptive mechanism. This paper proposes a link adaptive solution based on a simple but effective sliding window mechanism. Also a signal constellation rearrangement strategy is present to average out reliabilities of bits carried by(More)